Broome to Perth in 19 days

The west coast of Australia
is also known as the Pilbarra Region and includes the Ningaloo Reef and its peaceful whale sharks, Monkey Mia
and the Shark Bay World Heritage Area, The Pinnacles Desert, carpets of
wildflowers from July – October, the Dampier Archipelago and Lancelin Sand
Dunes.

This can be squeezed into 2 weeks if you leave Karijini
National Park, the wildflower loop, and Yanchep National Park. You will want to spend 3 days exploring Perth in addition to the drive.